I'm sure Ahsoka's age was retconned and she's supposed to be 16/17 at this point.

'Sabotage' was an excellent episode, I loved watching Anakin, Ahsoka and the CS analyst droid Ruso investigate the bombing, it was a cool look at the other side of Jedi work and the story of a section of Coruscant being against the war, Star Wars Vietnam.

Hasn't been retconned, they just make her seem older. One of the downsides of making a nine year old "too old for the training".